Paul Marshall Posted October 2, 2007 Share Posted October 2, 2007 I have a SC 46 with about 3hrs running and its constantly cutting out im running cool power at 10% and the tank appears to have no leaks.The needle is constantly adjusted by myself and other club flyers to no avail!!! it is fitted in a protech skystar Best guess is a air leak somwhere! What does every one else think???? Thanx PaulP.S it will cut at full tank but tends to do it 10 mins into a flight! Quote Link to comment Share on other sites More sharing options...
winchweight Posted October 2, 2007 Share Posted October 2, 2007 Is the clunk weight moving freely? Are the fuel lines all clear? Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted October 2, 2007 Share Posted October 2, 2007 Is the tank height correct, are there any pinholes in the tank lines inside the tank, is the clunk folding over ( I always insert a length of plastic /brass tube up into the clunk line to stop this ) is it overheating, is the idle setting correct, any head screws loose, carby loose, throttle rotor screw in place, have you tried a NEW plug? Quote Link to comment Share on other sites More sharing options...
Andy Green Posted October 2, 2007 Share Posted October 2, 2007 I had one with the same symptoms, I cured it eventually with an after market carb from Just Engines. (About £15 i think)Mine is now in a Cougar 2000 that I regularly prop hang at low level such is my confidence in the motor. Fuel is Prosynth 5% by the wayAndy Quote Link to comment Share on other sites More sharing options...
JT Posted October 3, 2007 Share Posted October 3, 2007 I had a similar problem a month or so after buying this motor. After some time we identified that one of the screws that retain the carb had come out. It wasn't obvious as it was the side covered by the needle adjustment.Once replaced, the motor was back on song. Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted October 3, 2007 Share Posted October 3, 2007 Could be an air leak....check all screws as suggested....also check backplate screws.Are you using a remote needle ie one mounted at the back of the motor rather than straight into the carb? If so there another couple of things to check....splits in the conecting tube for example. Also worth checking for any foreign bodies.....we had one recently that had a bit of crud floating around...the motor ran fine until the dirt got into the jet & blocked it....oh yes we had some fun finding that.......!!Take the blanking plug out of the carb (where the needle valve would fit) & take a look around.....you might find something in there!!!If the motor has run fine for its first 3 hours it should be fixable.....my money is on a blockage. If its never run properly then something on the motor is duff.....Good luck!!! Quote Link to comment Share on other sites More sharing options...
Paul Marshall Posted October 4, 2007 Author Share Posted October 4, 2007 thanx!I will check everything that you have all mentioned!the carb bolts stripped on first try i tryed to be as gentle as possible so i need to check the new bigger bolts im sure their depth is ok tho!the needle is at the front again im gona follow all the tips replace all fuel lines and filter and install a hotter plug its had quite a few plugs allready lol.im flying on sunday so i will post a report nice to know a replacement carb is £15 iv come from Motocross (injured at mo) and everything iv bought is great value for money!im totaly hooked now!!!!!iv also just bought a Kyasho Calamoto sport(low wing novice friendly) lol and a sc52 this engine on the re fitted mountings is way high so i will have to wait and see if it runs ok!!Thanx again guys and happy landings! Paul Quote Link to comment Share on other sites More sharing options...
Paul Marshall Posted October 5, 2007 Author Share Posted October 5, 2007 Hi Steve! come to think about it ! its never been reliable in my first model(Arising star) it was not arising when the wing sheared off lol! but thats another toic to discuss lol Quote Link to comment Share on other sites More sharing options...
Peter Eve Posted February 11, 2008 Share Posted February 11, 2008 I had a problem like this with an Evo 46 when i made the fuel line too long for an uphill run.Just a possibility. Quote Link to comment Share on other sites More sharing options...
Paul Marshall Posted February 11, 2008 Author Share Posted February 11, 2008 I finally cured my SC46 problems.............i bought a OS 46 AX it runs perfectly everytime! lol and at 75 pounds i could not complain! Quote Link to comment Share on other sites More sharing options...
Peter Eve Posted February 11, 2008 Share Posted February 11, 2008 I think you've hit the nail on the head, Paul - why didn't I buy an OS 46? Simply because I had read a review which couldn't say enough wonderful things about the Evo 46 and I believed it! There was a chap with an OS at the field yesterday and it gave no trouble. He was a real beginner, did his 5th flight while i watched.I will be wiser in future! Reputations aren't easily earned and I should have taken that as a guide. By the way, the more pressing problem is a new plane! I trashed it this morning - big time - they say everyone has to do it sometime but I was just beginning to hope that I'd got away with it! Quote Link to comment Share on other sites More sharing options...
Bruce Richards Posted February 11, 2008 Share Posted February 11, 2008 Paul,Do you want to sell the SC?Bruce Quote Link to comment Share on other sites More sharing options...
Paul Marshall Posted February 11, 2008 Author Share Posted February 11, 2008 Hi Peter!well i have got about 3 gallons of juice used up and i am on my 3rd plane which very nearly 'bit it' on Sunday much to the amusement of the lads. the wing moved on my trainer and it just went Kamikazi i did get it down and promptly called it a day lolDont worry about crashing our field claims at least 2 planes a wkd(iv no idea if thats good or bad)!Its part of the game at least it only injures the pocket not like my last motox accident which got me a nice helicopter ride to hospital.I think SC suffers from quality control problems there either perfect or give trouble which novices cannot overcome!What plane do you fancy next? Paul Quote Link to comment Share on other sites More sharing options...
Paul Marshall Posted February 11, 2008 Author Share Posted February 11, 2008 Hi Bruce,Yes i would like to sell it! one of the engine mounts (one hole) has broke off so its up to you?I can try and email a pick of it if you wishThanx Paul Quote Link to comment Share on other sites More sharing options...
Bruce Richards Posted February 11, 2008 Share Posted February 11, 2008 Paul,I will PM you if I can.Bruce Quote Link to comment Share on other sites More sharing options...
Bruce Richards Posted February 11, 2008 Share Posted February 11, 2008 Paul,No I can't see how to PM you. Please send pics to [email protected]Bruce Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted February 12, 2008 Share Posted February 12, 2008 Funny. I have never had any problems with the SC 46 or 40s. or any other SC engine. I did have one that kept cutting a few weeks ago, it was a hole in the clunk tube caused by nipping it against the side of the tank neck while installing the bung in the tank. Quote Link to comment Share on other sites More sharing options...
Paul Marshall Posted February 12, 2008 Author Share Posted February 12, 2008 Peter,I made the comment about SC quality due to the examples at the club! out of 5 SC's, 4 have been a problem and 1 has been perfect althings being equal they are expierenced modelers to, we came up with qaulity control as been the culprit! My SC 46 had all the club mystified and when it cut out the last time i flew i didnt get it down due to lack of expierence. So a OS it was!We checked everything numerous times but to no avail !Paul Quote Link to comment Share on other sites More sharing options...
Paul Marshall Posted February 12, 2008 Author Share Posted February 12, 2008 Bruce ,I will email you the pics as soon as i get chance! Paul Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted February 12, 2008 Share Posted February 12, 2008 All I can say is to repeat what I have said in other threads. Over the last 14 or so years I have used litereally dozens of SC engines from .12 to .46 two stroeks and .30 to .91 four strokes. Also several friends have used them. I have only ever had one faulty one.Currently I am using three 15s, two .30 FS, and about five .32s with no problems. I have several more in the engine cabinet.Ont he other hand I have had problems with O.S. FP and LA engines. Without changing anything else I have swapped them for an SC and cured the problem.I can only speak as I find. Quote Link to comment Share on other sites More sharing options...
Paul Marshall Posted February 13, 2008 Author Share Posted February 13, 2008 Oh yes i agree! I have spent twenty years racing motox and we all swear blind brand X is better than brand Y and jonny D. has had loads of problems with.................! im sure you get the picture i would get another SC probs a 4 stroke!so yes defo speak as you find!Paul Quote Link to comment Share on other sites More sharing options...
Bri. Posted June 9, 2008 Share Posted June 9, 2008 Hi I have an SC52 4 Stroke and it is "spot on " and at £75 is a snip. Quote Link to comment Share on other sites More sharing options...
Paul Marshall Posted June 12, 2008 Author Share Posted June 12, 2008 Thats a bargain! I have started my motocrossing again and comparing parts prices and what you get for your money you cannot touch this Hobby/sport! Quote Link to comment Share on other sites More sharing options...
Andy Gates Posted July 10, 2008 Share Posted July 10, 2008 My SC 52 was a real bitch, forever cutting on throttle up during flight.Eventually replaced the spring in the carb with a TT one, this meant the barrel then followed the groove as it should have been rather than sticking and making the mixture go lean Quote Link to comment Share on other sites More sharing options...
Paul Marshall Posted November 13, 2008 Author Share Posted November 13, 2008 Thanks Andy looking to sort out my Sc as I hate being beet by anything! I will have a look at the carb! Thank Paul Quote Link to comment Share on other sites More sharing options...
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